[meteorite-list] Oriented chondrules?

[mark ford]

Darren and list,

 I have seen Some pieces of NWA 869 that have similar oriented
Chondrules, (even though some people have classified it as a 3.8),
maybe its due to some sort of early impact deformation, otherwise you
would you not expect the chondrules to be a lot more indistinct? ...

Interesting thread this!


Best,
Mark Ford



-----Original Message-----
From: Graham Christensen [mailto:voltage at telus.net] 
Sent: Tuesday, March 08, 2005 8:31 AM
To: Meteorite-list at meteoritecentral.com
Subject: Re: [meteorite-list] Oriented chondrules?

Hi Darren
Chondritic meteorites come from asteroids that aren't quite large enough
to 
have completely melted, but usually still large enough to cause some
thermal 
alteration. The heat that was present might have made the chondrules 
sufficiently pliable that they squished into oval shapes due to the
downward 
pressure from the material that was above it in its parent asteroid. Or,

possibly the chondrules were already elongated but the pressure from
above 
caused them to settle that way while the matrix was still soft.

Just throwing out ideas,
Graham

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Graham Christensen
voltage at telus.net
http://www.geocities.com/aerolitehunter
msn messenger: majorvoltage at hotmail.com


----- Original Message ----- 
From: "Darren Garrison" <cynapse at charter.net>
To: <meteorite-list at meteoritecentral.com>
Sent: Monday, March 07, 2005 11:24 PM
Subject: [meteorite-list] Oriented chondrules?


(Sorry, last question of the night.)

Anyone know anything about "oriented" chondrules in a meteorite?  I was 
looking at the scan of that
condrite that I had shown in the question about polishing (thanks to all
who 
gave advise, by the
way) and noticed that, for objects in the matrix that are oblong, the
long 
axises of a large
percentage of them seem to be aligned in a prefered direction rather
than 
point in random
directions.

Here is the base image:
http://webpages.charter.net/garrison6328/base_image.jpg

And one with arrows added to a few of the larger objects.  Many other 
chondrules seem to tend to be
aligned in the same direction.

http://webpages.charter.net/garrison6328/flow_direction.jpg
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